Gramophone and other sound-reproducing apparatus



Jan. 22, 1929.

J. F REY GRAIOPHONE AND OTHER SOUND REPRODUCING APPARATUS Filed July 28, 1924 FIEJ Inventoi- Patented Jan. 22, 1929.

UNITED STATES PATENT OFFICE.

JUAN FREY, OF BARCELONA, SPAIN.

GRAMOPHONE AND OTHER. SOUND-REPRODUCING APPARATUS.

It is known that the sounds reproduced in gramophones and in wireless receiving apparatus are defective, especially in regard to purity and intensity, and the invention has for its object to remedy these defects.

According to the invention, means are provided for utilizing the vibrations of the diaphragm of the sound reproduce! at. both its faces whereby a better reproduction is secured.

According to the invention the sound reproducer is mounted upon a flat plate disposed within the horn, which is thus divided into two parts or chambers, into each of which are emitted the sounds from the respective faces or sides of the diaphragm. The flat plate may consist of a wooden plate, and the horn may also be of wood, whereby a sound resonator is provided which preserves the quality or purity of the sounds emitted.

The invention is illustrated by way of example in the accompanying drawings, in which,

Figure l is a. section of a horn having a flat plate of wood,

Figure 2 is a plan view corresponding to Figure 1, and

Figure 3 is a sectional view, to an enlarged scale, of the sound reproducer and the means by which it is mounted upon the wooden plate.

The horn C, advantageously made of wood, may be provided, as illustrated, of truncated pyramidal shape having the edge at the wider partcurved on two of its sides, the horn havin centrally mounted in the interior a wooden plate B, fixed in position in any suitable manner, as by means of glue, ridges or mouldings, or grooves formed upon or in the walls of the horn. The horn is thus divided in two compartments or chambers D and E, through which are outwardly emitted the sound vibrations from the respective faces or sides of the diaphragm of the sound reproducer A, which is fixed by its frame to one end of the wooden plate 13. The latter has an opening F which transmits the sounds towards the compartment or chamber E, while the sound reproducer itself is disposed in the con'ipartment or chamber D.

The horn may be adapted as at G for being supported, and may be formed or con structed in any desired manner.

It will be understood that the invention is widely applicable to gramophones and to other apparatus for the reproduction of sounds as well to wireless receiving apnas ratus.

I claim 1. In gramophones and other sound reproducing apparatus, a horn, a flat plate mounted in the horn and (:lividing' the interior into two chambers, and a sound reproducer comprising a diaphragm adapted to be vibrated for emission of the sounds to be reproduced, the said sound reproducer being carriedby the flat plate and the flat plate being formed so that the sound vibrations are emitted from the two faces of the diaphragm respectively into the two chambers of the horn.

2. In gramophones and other sound reproducing apparatus, a horn, a wooden plate mounted in the horn and dividing the inte rior into two chambers, an opening in the said wooden plate and a sound reproducer comprising a vibratory diaphragm adapted for the emission of sounds from both faces thereof, the said sound reproducer being mounted upon one side of the wooden plate in register with the opening therein.

J UAN FREY. 

